TY - JOUR
T1 - Serially-concatenated LDGM codes for correlated sources over gaussian broadcast channels
AU - Hernaez, Mikel
AU - Crespo, Pedro
AU - Del Ser, Javier
AU - Garcia-Frias, Javier
PY - 2009
Y1 - 2009
N2 - We propose a superposition scheme, based on the use of serially-concatenated LDGM codes, for the transmission of spatially correlated sources over Gaussian broadcast channels. The messages intended for each receiver are independently encoded using the same code. In this manner, a strong degree of correlation is kept between the encoded sequences,which are then modulated with different energies and symbolwise added. By properly designing the encoding process, simulation results show that our proposed scheme easily outperforms the suboptimal theoretical limit assuming separation between source and channel coding.
AB - We propose a superposition scheme, based on the use of serially-concatenated LDGM codes, for the transmission of spatially correlated sources over Gaussian broadcast channels. The messages intended for each receiver are independently encoded using the same code. In this manner, a strong degree of correlation is kept between the encoded sequences,which are then modulated with different energies and symbolwise added. By properly designing the encoding process, simulation results show that our proposed scheme easily outperforms the suboptimal theoretical limit assuming separation between source and channel coding.
KW - Concatenated LDGM codes
KW - Correlated sources
KW - Gaussian broadcast channel
KW - Superposition coding
UR - http://www.scopus.com/inward/record.url?scp=70350503374&partnerID=8YFLogxK
U2 - 10.1109/LCOMM.2009.091289
DO - 10.1109/LCOMM.2009.091289
M3 - Article
AN - SCOPUS:70350503374
SN - 1089-7798
VL - 13
SP - 788
EP - 790
JO - IEEE Communications Letters
JF - IEEE Communications Letters
IS - 10
ER -